My friend was out shopping one afternoon, and her husband was bathing their son, who was 2.5. Let's call the boy Jamie. His dad left the bathroom briefly, came back, and Jamie was under the water. He did CPR. The poor sweetheart was helicoptered to a hospital an hour away, and they wouldn't let the parents go with him as they were automatically under suspicion of abuse. Jamie should have been OK to sit upright, but it transpired from later tests that he had probably had a seizure in those few moments. Never had one before. Friend believed her husband that he had only left the room briefly, because Jamie was still alive when the medics came. Plus, the husband is a 999 employee and knows the dangers, and that's why he knew how to do CPR.
My friend came home from shopping and the place was mad with police cars, sirens, a chopper, the works. I honestly don't think she'll ever recover.
When they got to the hospital - and all that way they had no idea if Jamie was alive or dead - they were taken into a room to be interviewed, and they wouldn't tell them if Jamie had survived the flight!
Anyway, he was alive, but in a coma and desperately ill. He spent THREE MONTHS in hospital, and then made a full recovery after about a year of outpatient physio.
Jamie is the most darling child, a total angel. My friend would never, ever have recovered if he had died.
This is why I feel strongly about this. Drowning happens in seconds. Countries should make pool fences, self-closing hinges, and locks mandatory.